Atjtomatic daiffpee-begxtbatoe



I A. BACKLUND.

AUTOMATIC DAMPER REGULATOR.

APPLICATION FILED FEB. I9. I919.

Patented June 24, 1919.

. u I'l I. I I IIII I I I I h liliinliib ATTORIVEV s PETE/I5 cc,mmrmlmmummu. a L

UNITED STATES PATENT OFFICE.

ISAACA, nncnnunn, on cnroAoo, ILLINOIS,-

AUTOMATIC nnmrnn-nneunn'ron. 9

Application filed February 19, 1919. Serial No. 278,085.

To all whom it may concern .1 y a Beit known that I, ISAAC A. BAOKLUND, a citizen of the United States, residing at Chicago, in the countyof Cook and State of Illinois, have invented certain new and useful Improvements in Automatic Damper- Regulators, of which the following is a specification. I I

This invention relates to automatic damper regulators of the class illustrated and described in U. S. Patent No. 1,276,002, issued August 20, 1918, wherein employed a hydraulic motor operatively connected to the damper, said motor having a controlling valve which is regulated by steam pressure through the agency of a quantity of mercury. The object of the. presentinvention isthe perfecting of the apparatus by which the mercury is utilized. to afford amaximum of efliciency with aneconomical use of the liquid agent. A i

With these ends in view the invention consists in certain novel devices, and in the adaptation and combination ,ofthe same.

The accompanying drawing is a View shown partly in front elevation and partly in vertical section of a damper regulator embodying my improvements.

The reference numeral 1 designates a steam boiler having a smoke stack 2 provided with a damper indicated by dotted lines 3. Said damper is normallyheld in its open position by means ofaweight 4 attached to an arm 5 of a lever which is connected to the damper spindle 6. The other arm 5 of said lever is connected by a chain .1

or cord 7 passing about pulleys 8 and 9 to the underside of a vertically movable frame 10. This frame is connected to and operates in unison with a plunger 11 extending through a stuffing box 12 into the cylinder 12 of a hydraulic motor.

Communicating with the cylinder chamber is a'pipe 13 connected with a pipe 14 through which water under pressure is sup plied to the cylinder and is also connected with a waste pipe 15 through which the water is discharged. The admission and discharge of the water is governed by means of a three-way valve 16 of the rotary type, preferably, provided in a casing 17 to which the aforesaid pipes are connected.

By regulating the valve 16 to admit pressure water into the cylinder 12, the plunger p p of Letters Peters Patelited une 124, 1919.

11 forced upwardly and acting the medium ofthe frame 10 and cord 7 effects a closing movement to the damper. 3 in oppositionto the ,weight it. When the valve is turnedto close communication betweenthe pressure water pipe 14 and the cylinder pipe 13 to establish connnunication between the latter and the waste pipe 15, the water escapes from cylinder 12 to allowtheplunger and attached frame 10 to descend,wherew upon the weight 4 asserts itself to return the damper to its open illustrated position. The valve 16 is controlled by connecting the handle 18 thereof by means of a rod 19 with an arm 20 ofalever fulcrumed at21 and having a heavy body 22 on its other arm,

20 which acts counter to the weight of the valve regulating devices which are suspend ed from the lever arm 20. The valve-regulating devices, like those disclosed in the referred-to patent, comprise a liquid-tight vessel 23. through which extends an npright pipe 23 having openings 24 and 24 which aflord communication with the interior of the vessel. a

. The vessel is rigidly connected to the pipe 23 whose lower end is connected bya T- fitting 25 with a flexible tube 26 extending downwardly and having its lower end connected with a pipe 27 which extends into and terminates adjacent to the bottom of a tank28. The tank 28 serves asa reservoir for aquantity of mercury or other suitable liquid, indicated by 29.

and the upper end of the tank 28, whereby the steam pressure acting downwardly in the reservoir tends to force the mercury through tube 26 into the vessel 23.

When the steam pressure is sufliciently from the service pipe 14 to the motor cylinder 12. i

When this occurs, an upward movement is imparted to plunger 11,1'esultmg in a eloslng movement of the dan1per8 with a consequent Connection is had by means of a pipe 30 between the steam space within the boiler 1 throttling of the furnace draft and a reduction in the steam generation.

The steam pressure would. thereupon decrease, allowing the mercury to return from vessel 23 into the reservoir with a corre sponding action of the valve 16, resulting in the motor being aifected to enable the weight a to open the damper.

By suitably positioning the; body- 22 on i lever 2020 the power of a quantity of mercury in the vessel 23 may be varied to regulate the apparatus to control the boiler steam pressure.

Inthe operation of the apparatus as described above; and in the referredto overcomethese objections by the following described a pp'lianees, comprising a receptacle 32 preferably depending from the "vessel 23, as by'in'eans of-a"pipe 33 'connected to but lia ving 'no coinnninicationthrough the fitting 25. Adjacent ltdl'lh upper end of the pipe 33 is afsmall hole 34ropening into the external atmosphere; *andbelow P said hole the pipe 33 'is' conneete'dby a second pipe 35-with theupper end of th'e vessel 23, de-

sirably 'bj' 'me'ans of an elb w 36 coupling the pipe 34k to "the pipe 23, as shown. 1

A eoe'k87 may be orovided in thebottom of receptacle 32' for withdrawing" 'mercury collected therein, or the same may be accomplished by d'etaching the receptacle from the suspending pipe 38.

In operation, the 'vapor from mercury in vessel 23 escapesthrough the hole 24 and pipe 23' -into pipe 35, iiiwhich the vaporized mercury condenses anddescends in the form of a" liquidt'-l1rough'- pipe 33 into the rei ceptacle' 82. The hole 34afiord's' admission for air i'nto'the apparatus to retain an atmospheric pressure, or nearly so, 1n the vessel 23, receptacle 32 and in the pipes conne'cted therewith.

What. I claim, is

1. In a damper-regulating apparatus of the character described, the combination with a liquid reservoir, a vertically movable vessel into which a liquid is elevated by steam pressure from said reservoir, of a receptacle located below said vessel and arranged to reciprocate in unison therewith, and pipes affording communicative connections between said receptacle and the vessel.

2.111 a damper-regulating apparatus of the character described, the combination with a liquid reservoir, avertically movable vessel into which a liquid is elevated by steam pressure from saidreservoir, of a receptacle located'below said vessel, and pipes affording communicative connections between said receptacle and the vessel, one of said pipes being providedwith alropening'intothe external"atmosphere and disposed outside of the eomi'nunicativeconncc tionsbetween the vessel and receptacle.

3; In a dalnper-regulating apparatus of the character described, the combination with a liquid reservoir, a vertically movable vessel into which a' liquid is elevated by steani pressure from said reservoir, of a re-- ceptacle located below said'vessel and arranged to reciprocate in unisontherewith, and pipes ali'ording communicative connections between said receptacle andthe vessel, one of said pjpes being provided with an opening into the external atmosphere and disposed outside of the communicative connectionsbetween the vessel and the receptacle.

Signed at Chicago, Illinoisythis 3rd day of February, 1919.

' ISAAC A'. BACKLUND.

WVitness I." GREEN.

copie si'rif this iltent may lie obtained forfiv'e cents each, by addressing the Commissioner of Patents,

- Washington, D. G. 

